Popover, dialog, invoker commands, our entire production app uses these everywhere and it works really well! The fact that dialogs and popovers are rendered on the "top layer" and that nested popovers are also automatically stacked on top of each other and have 'cascading close' shows how well these standards were designed.

The only hard thing is still to position a popover near the element that triggers it, such as when you want to create a context menu that has to render above/below the button that triggered it. There is anchor positioning in CSS now but support is still limited and I find it hard to wrap my head around.

LLMs are also terrible at these new standards. If they even know about them, they often think they're not baseline yet and they have almost zero training data compared to the giant mountain of weird JS and CSS that people had to use before the introduction of these standards.